Real Time Terahertz Imaging Using A Quantum Cascade Laser And Uncooled Microbolometer Focal Plane Array

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Real-Time Terahertz Imaging Using a Quantum Cascade Laser and Uncooled Microbolometer Focal Plane Array

Author :
Publisher :
ISBN 13 :
Total Pages : 81 pages
Book Rating : 4.:/5 (244 download)

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Book Synopsis Real-Time Terahertz Imaging Using a Quantum Cascade Laser and Uncooled Microbolometer Focal Plane Array by :

Download or read book Real-Time Terahertz Imaging Using a Quantum Cascade Laser and Uncooled Microbolometer Focal Plane Array written by and published by . This book was released on 2008 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real-time imaging in the terahertz (THz) spectral range was achieved using an uncooled, 160 120 pixel infrared microbolometer camera and a milliwatt-scale quantum cascade laser (QCL). By replacing the camera's original focusing optics with a Tsurupica-based lens and minimizing diffraction effects incurred by the QCL output beam, an imaging scheme was developed in which the camera's focal plane array successfully detected wavelengths that are more than an order of magnitude longer than those for which the system is designed. Moreover, the incorporation of parabolic reflecting optics yielded a capability to produce high-resolution images of objects placed within the beam path. Despite the low laser powers employed, this scheme allows high-contrast imaging of various objects concealed by a wide range of nonmetallic materials confirming the suitability of this technology for homeland security screening applications. Furthermore, the identification of relatively obscure security features in British currency notes suggests that Terahertz imaging could serve a future role as a detection mechanism against assorted counterfeiting practices. An extensive comparative analysis of experimental data produced using two QCLs (resonating at 2.8 and 3.6 THz) provides additional insight into the physics underlying these results, and suggests methods by which this imaging technology could be further improved.

Real Time Imaging Analysis Using a Terahertz Quantum Cascade Laser and a Microbolometer Focal Plane Array

Author : Kevin William Buchanan
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Real Time Imaging Analysis Using a Terahertz Quantum Cascade Laser and a Microbolometer Focal Plane Array by : Kevin William Buchanan

Download or read book Real Time Imaging Analysis Using a Terahertz Quantum Cascade Laser and a Microbolometer Focal Plane Array written by Kevin William Buchanan and published by . This book was released on 2008 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is widely published that the terahertz (THz) spectral range has potential for imaging in the fields of military and security applications. The Sensors Research Laboratory previously achieved real-time imaging of concealed objects using a 1mW quantum cascade laser (QCL) and an uncooled vanadium oxide/silicon nitride based microbolometer. This thesis introduces an amorphous silicon based microbolometer with improved NETD in the 8-12 micrometer infrared spectral range. The QCL is usually operated in pulsed mode with rate in the hundreds of kHz which is much higher than the cut-off frequency of microbolometers of about tens of Hz. This indicates that neither camera should be able to detect the individual pulses of the THz beam. A detailed analysis showed that microbolometers can only detect the average power. Earlier experiments were then reproduced using the amorphous silicon based camera to assess the image quality but found it to be inferior to the silicon nitride based camera. These observations indicate that the absorption of THz in amorphous silicon is much weaker than silicon nitride. Other materials used to conceal military assets were analyzed and imaged to prove in principal the possibility of active THz imaging detection at a distance in narrow atmospheric windows.

Terahertz Imaging Via a Microbolometer Camera Under Illumination of a Quantum Cascade Laser

Author : Ioannis Nellas
Publisher :
ISBN 13 :
Total Pages : 33 pages
Book Rating : 4.:/5 (697 download)

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Book Synopsis Terahertz Imaging Via a Microbolometer Camera Under Illumination of a Quantum Cascade Laser by : Ioannis Nellas

Download or read book Terahertz Imaging Via a Microbolometer Camera Under Illumination of a Quantum Cascade Laser written by Ioannis Nellas and published by . This book was released on 2010 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The terahertz (THz) region of the electromagnetic spectrum has not been fully utilized due to the lack of compact and efficient sources as well as detectors. This thesis aimed on characterizing a quantum cascade laser (QCL) beam and achieving high quality real-time THz imaging using a 160x120 pixel FLIR A20M microbolometer camera designed to operate in long wave infrared range. The FTIR spectroscopy of the QCL beam revealed that lasing could be achieved at 2.85 and 2.91 THz frequencies depending on the bias current. This behavior was analyzed using the longitudinal modes of the laser and found to correspond well with the experimental observations. Real-time imaging of concealed objects in transmission mode was accomplished using the silicon nitride-based microbolometer camera under illumination via the QCL with average power less than 1 mW. The larger extent of the object required the expansion of the narrow laser beam using a parabolic reflector and refocus on the camera using a second parabolic reflector. The standard Ge lens of the camera was replaced by a Tsurupica lens since the earlier lens was opaque to THz radiation. The real-time imaging can be extended to reflection mode as well as longer standoff distances using higher power THz lasers.

Mid-Infrared and Terahertz Quantum Cascade Lasers

Author : Dan Botez
Publisher : Cambridge University Press
ISBN 13 : 1108427936
Total Pages : 551 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Mid-Infrared and Terahertz Quantum Cascade Lasers by : Dan Botez

Download or read book Mid-Infrared and Terahertz Quantum Cascade Lasers written by Dan Botez and published by Cambridge University Press. This book was released on 2023-06-30 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art overview of this rapidly expanding field, featuring fundamental theory, practical applications, and real-life examples.

Infrared and Terahertz Detectors, Third Edition

Author : Antoni Rogalski
Publisher : CRC Press
ISBN 13 : 1351984764
Total Pages : 1044 pages
Book Rating : 4.3/5 (519 download)

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Book Synopsis Infrared and Terahertz Detectors, Third Edition by : Antoni Rogalski

Download or read book Infrared and Terahertz Detectors, Third Edition written by Antoni Rogalski and published by CRC Press. This book was released on 2019-01-10 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of Infrared and Terahertz Detectors provides a comprehensive overview of infrared and terahertz detector technology, from fundamental science to materials and fabrication techniques. It contains a complete overhaul of the contents including several new chapters and a new section on terahertz detectors and systems. It includes a new tutorial introduction to technical aspects that are fundamental for basic understanding. The other dedicated sections focus on thermal detectors, photon detectors, and focal plane arrays.

Advances in Terahertz Detection and Imaging

Author : Lianhe Li
Publisher : Frontiers Media SA
ISBN 13 : 2889760200
Total Pages : 120 pages
Book Rating : 4.8/5 (897 download)

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Book Synopsis Advances in Terahertz Detection and Imaging by : Lianhe Li

Download or read book Advances in Terahertz Detection and Imaging written by Lianhe Li and published by Frontiers Media SA. This book was released on 2022-04-28 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Detectors and Sources for THz and IR

Author : Fedir F. Sizov
Publisher : Materials Research Forum LLC
ISBN 13 : 1644900742
Total Pages : 330 pages
Book Rating : 4.6/5 (449 download)

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Book Synopsis Detectors and Sources for THz and IR by : Fedir F. Sizov

Download or read book Detectors and Sources for THz and IR written by Fedir F. Sizov and published by Materials Research Forum LLC. This book was released on 2020-05-05 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: IR and THz technologies are widely used in security screening and surveillance, astronomy, spectroscopy, biomedicine, food and package inspection, detection of concealed weapons, vision through camouflage, etc. There are increasing demands for the fast transmission of large amounts of data. THz radiation penetrates dielectric materials like plastics, ceramics or cardboard allowing contact-free testing. Medical imaging technologies can provide guidance for surgeons in delimiting the margins of tumors, help clinicians to visualize diseased areas, etc. Keywords: THz and IR Detectors, THz and IR Sources, Superconducting Photon Detectors, Superconducting THz Detectors, Graphene-based Detectors, THz Sensors with Metamaterials, Photoconductive Antenna Detectors, Imaging, Communication, Spectroscopy, Sensing, Security Screening, Surveillance, Astronomy, Biomedicine, Food Inspection, Package Inspection, Concealed Weapons Detection, Transmission of Large Amounts of Data, Non-destructive Testing, Contact-free Testing, Medical Imaging Technologies.

Handbook of Terahertz Technologies

Author : Ho-Jin Song
Publisher : CRC Press
ISBN 13 : 9814613096
Total Pages : 606 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Handbook of Terahertz Technologies by : Ho-Jin Song

Download or read book Handbook of Terahertz Technologies written by Ho-Jin Song and published by CRC Press. This book was released on 2015-04-15 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg

Terahertz Biomedical Science and Technology

Author : Joo-Hiuk Son
Publisher : CRC Press
ISBN 13 : 1466570458
Total Pages : 374 pages
Book Rating : 4.4/5 (665 download)

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Book Synopsis Terahertz Biomedical Science and Technology by : Joo-Hiuk Son

Download or read book Terahertz Biomedical Science and Technology written by Joo-Hiuk Son and published by CRC Press. This book was released on 2014-06-13 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of applications including scientific spectroscopy, security screening, and medical imaging have benefitted from the development and utilization of new and emerging terahertz (THz) generation and detection techniques. Exploring recent discoveries and the advancements of biological behaviors through THz spectroscopy and imaging and the devel

THz and Security Applications

Author : Carlo Corsi
Publisher : Springer
ISBN 13 : 9401788286
Total Pages : 317 pages
Book Rating : 4.4/5 (17 download)

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Book Synopsis THz and Security Applications by : Carlo Corsi

Download or read book THz and Security Applications written by Carlo Corsi and published by Springer. This book was released on 2014-05-06 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings comprise invited papers from highly experienced researchers in THz technology and security applications. THz detection of explosives represents one of the most appealing technologies to have recently emerged in dealing with terrorist attacks encountered by civil security and military forces throughout the world. Discussed are the most advanced technologies and developments, the various points of operational strength and weaknesses as well as are suggestions and predictions the best technological solutions to overcome current operational limits. The current status of various levels of cooling in THz detectors, sources and associated electronics are also addressed. The goal was to provide a clear view on the current technologies available and the required advances needed in order to achieve more efficient systems. This goal was outlined in part by establishing the baseline of current uncertainty estimations in physics-based modelling and the identification of key areas which require additional research and development.

2D Materials for Infrared and Terahertz Detectors

Author : Antoni Rogalski
Publisher : CRC Press
ISBN 13 : 1000204936
Total Pages : 265 pages
Book Rating : 4.0/5 (2 download)

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Book Synopsis 2D Materials for Infrared and Terahertz Detectors by : Antoni Rogalski

Download or read book 2D Materials for Infrared and Terahertz Detectors written by Antoni Rogalski and published by CRC Press. This book was released on 2020-10-25 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Infrared and Terahertz Detectors provides an overview of the performance of emerging detector materials, while also offering, for the first time, a comparison with traditional materials used in the fabrication of infrared and terahertz detectors. Since the discovery of graphene, its applications to electronic and optoelectronic devices have been intensively researched. The extraordinary electronic and optical properties allow graphene and other 2D materials to be promising candidates for infrared (IR) and terahertz (THz) photodetectors, and yet it appears that the development of new detectors using these materials is still secondary to those using traditional materials. This book explores this phenomenon, as well as the advantages and disadvantages of using 2D materials. Special attention is directed toward the identification of the most-effective hybrid 2D materials in infrared and terahertz detectors, as well as future trends. Written by one of the world’s leading researchers in the field of IR optoelectronics, this book will be a must-read for researchers and graduate students in photodetectors and related fields. Features • Offers a comprehensive overview of the different types of 2D materials used in fabrication of IR and THz detectors, and includes their advantages/disadvantages • The first book to compare new detectors to a wide family of common, commercially available detectors that use traditional materials.

Proceedings of the Seventh International Symposium on Technology and the Mine Problem

Author :
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Proceedings of the Seventh International Symposium on Technology and the Mine Problem by :

Download or read book Proceedings of the Seventh International Symposium on Technology and the Mine Problem written by and published by . This book was released on 2006 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the ... International Symposium on Technology and the Mine Problem

Author :
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Proceedings of the ... International Symposium on Technology and the Mine Problem by :

Download or read book Proceedings of the ... International Symposium on Technology and the Mine Problem written by and published by . This book was released on 2006 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Encyclopedia of Modern Optics

Author : Bob D. Guenther
Publisher : Academic Press
ISBN 13 : 0128149825
Total Pages : 2253 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Encyclopedia of Modern Optics by : Bob D. Guenther

Download or read book Encyclopedia of Modern Optics written by Bob D. Guenther and published by Academic Press. This book was released on 2018-02-14 with total page 2253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Modern Optics, Second Edition, Five Volume Set provides a wide-ranging overview of the field, comprising authoritative reference articles for undergraduate and postgraduate students and those researching outside their area of expertise. Topics covered include classical and quantum optics, lasers, optical fibers and optical fiber systems, optical materials and light-emitting diodes (LEDs). Articles cover all subfields of optical physics and engineering, such as electro-optical design of modulators and detectors. This update contains contributions from international experts who discuss topics such as nano-photonics and plasmonics, optical interconnects, photonic crystals and 2D materials, such as graphene or holy fibers. Other topics of note include solar energy, high efficiency LED’s and their use in illumination, orbital angular momentum, quantum optics and information, metamaterials and transformation optics, high power fiber and UV fiber lasers, random lasers and bio-imaging. Addresses recent developments in the field and integrates concepts from fundamental physics with applications for manufacturing and engineering/design Provides a broad and interdisciplinary coverage of specialist areas Ensures that the material is appropriate for new researchers and those working in a new sub-field, as well as those in industry Thematically arranged and alphabetically indexed, with cross-references added to facilitate ease-of-use

Journal of the National Institute of Information and Communications Technology

Author :
Publisher :
ISBN 13 :
Total Pages : 396 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Journal of the National Institute of Information and Communications Technology by :

Download or read book Journal of the National Institute of Information and Communications Technology written by and published by . This book was released on 2008 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Sensing with Terahertz Radiation

Author : Daniel Mittleman
Publisher : Springer
ISBN 13 : 3540456015
Total Pages : 351 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis Sensing with Terahertz Radiation by : Daniel Mittleman

Download or read book Sensing with Terahertz Radiation written by Daniel Mittleman and published by Springer. This book was released on 2013-02-26 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is two-fold. First, the various different methods of accessing the THz range are discussed, with a view to convince the reader that there have been qualitative and significant improvements over older, more conventional techniques. The text makes it clear that these improvements enable practical "real-world" applications of THz technology, in a manner which would not have been possible before. Second, the demonstrations and feasibility tests described serve as compelling evidence of the utility of such devices. Due to the unique characteristics of THz radiation and its interaction with materials, these devices have substantial advantages over other competing technologies in a number of different areas.

Terahertz and Mid Infrared Radiation

Author : Mauro Pereira
Publisher : Springer Science & Business Media
ISBN 13 : 9400707681
Total Pages : 218 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Terahertz and Mid Infrared Radiation by : Mauro Pereira

Download or read book Terahertz and Mid Infrared Radiation written by Mauro Pereira and published by Springer Science & Business Media. This book was released on 2011-02-26 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz (THz) and Mid-Infrared (MIR) radiation (TERA-MIR) can be transmitted through nearly any material without causing biological harm. Novel and rapid methods of detection can be created with devices operation in these spectral ranges allowing scanning for weapons, detecting hidden explosives (including plastic landmines), controlling the quality of food and a host of other exciting applications. This book focuses on mathematical and physical aspects of the field, on unifying these two spectral domains (THz and MIR) with regard to common sources, detectors, materials and applications, and on key interdisciplinary topics. The main THz and MIR source is the quantum cascade laser (QCL). Thus significant attention is paid to the challenge of turning this advanced technology into affordable commercial devices so as to exploit its enormous potential. However other alternatives to THz QCLs are also presented, e.g. sub-terahertz imaging from avalanching GaAs bipolar transistors, Josephson junctions as THz sources, semiconductor materials for pulsed THz sources, superconducting THz electronics with Josephson vortices. In summary this book delivers a global picture of the state of the art in TERA-MIR generation, detection and applications.